1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51 #include <linux/module.h>
52 #include <linux/init.h>
53 #include <linux/netdevice.h>
54 #include <linux/inetdevice.h>
55 #include <linux/seq_file.h>
56 #include <linux/bootmem.h>
57 #include <linux/highmem.h>
58 #include <linux/swap.h>
59 #include <linux/slab.h>
60 #include <net/net_namespace.h>
61 #include <net/protocol.h>
64 #include <net/route.h>
65 #include <net/sctp/sctp.h>
66 #include <net/addrconf.h>
67 #include <net/inet_common.h>
68 #include <net/inet_ecn.h>
70 /* Global data structures. */
71 struct sctp_globals sctp_globals __read_mostly
;
72 DEFINE_SNMP_STAT(struct sctp_mib
, sctp_statistics
) __read_mostly
;
75 struct proc_dir_entry
*proc_net_sctp
;
78 struct idr sctp_assocs_id
;
79 DEFINE_SPINLOCK(sctp_assocs_id_lock
);
81 /* This is the global socket data structure used for responding to
82 * the Out-of-the-blue (OOTB) packets. A control sock will be created
83 * for this socket at the initialization time.
85 static struct sock
*sctp_ctl_sock
;
87 static struct sctp_pf
*sctp_pf_inet6_specific
;
88 static struct sctp_pf
*sctp_pf_inet_specific
;
89 static struct sctp_af
*sctp_af_v4_specific
;
90 static struct sctp_af
*sctp_af_v6_specific
;
92 struct kmem_cache
*sctp_chunk_cachep __read_mostly
;
93 struct kmem_cache
*sctp_bucket_cachep __read_mostly
;
95 long sysctl_sctp_mem
[3];
96 int sysctl_sctp_rmem
[3];
97 int sysctl_sctp_wmem
[3];
99 /* Return the address of the control sock. */
100 struct sock
*sctp_get_ctl_sock(void)
102 return sctp_ctl_sock
;
105 /* Set up the proc fs entry for the SCTP protocol. */
106 static __init
int sctp_proc_init(void)
108 if (percpu_counter_init(&sctp_sockets_allocated
, 0))
110 #ifdef CONFIG_PROC_FS
111 if (!proc_net_sctp
) {
112 proc_net_sctp
= proc_mkdir("sctp", init_net
.proc_net
);
114 goto out_free_percpu
;
117 if (sctp_snmp_proc_init())
118 goto out_snmp_proc_init
;
119 if (sctp_eps_proc_init())
120 goto out_eps_proc_init
;
121 if (sctp_assocs_proc_init())
122 goto out_assocs_proc_init
;
123 if (sctp_remaddr_proc_init())
124 goto out_remaddr_proc_init
;
128 out_remaddr_proc_init
:
129 sctp_assocs_proc_exit();
130 out_assocs_proc_init
:
131 sctp_eps_proc_exit();
133 sctp_snmp_proc_exit();
136 proc_net_sctp
= NULL
;
137 remove_proc_entry("sctp", init_net
.proc_net
);
140 percpu_counter_destroy(&sctp_sockets_allocated
);
143 #endif /* CONFIG_PROC_FS */
149 /* Clean up the proc fs entry for the SCTP protocol.
150 * Note: Do not make this __exit as it is used in the init error
153 static void sctp_proc_exit(void)
155 #ifdef CONFIG_PROC_FS
156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
159 sctp_remaddr_proc_exit();
162 proc_net_sctp
= NULL
;
163 remove_proc_entry("sctp", init_net
.proc_net
);
166 percpu_counter_destroy(&sctp_sockets_allocated
);
169 /* Private helper to extract ipv4 address and stash them in
170 * the protocol structure.
172 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
173 struct net_device
*dev
)
175 struct in_device
*in_dev
;
176 struct in_ifaddr
*ifa
;
177 struct sctp_sockaddr_entry
*addr
;
180 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
185 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
186 /* Add the address to the local list. */
187 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
189 addr
->a
.v4
.sin_family
= AF_INET
;
190 addr
->a
.v4
.sin_port
= 0;
191 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
193 INIT_LIST_HEAD(&addr
->list
);
194 list_add_tail(&addr
->list
, addrlist
);
201 /* Extract our IP addresses from the system and stash them in the
202 * protocol structure.
204 static void sctp_get_local_addr_list(void)
206 struct net_device
*dev
;
207 struct list_head
*pos
;
211 for_each_netdev_rcu(&init_net
, dev
) {
212 __list_for_each(pos
, &sctp_address_families
) {
213 af
= list_entry(pos
, struct sctp_af
, list
);
214 af
->copy_addrlist(&sctp_local_addr_list
, dev
);
220 /* Free the existing local addresses. */
221 static void sctp_free_local_addr_list(void)
223 struct sctp_sockaddr_entry
*addr
;
224 struct list_head
*pos
, *temp
;
226 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
227 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
233 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
234 int sctp_copy_local_addr_list(struct sctp_bind_addr
*bp
, sctp_scope_t scope
,
235 gfp_t gfp
, int copy_flags
)
237 struct sctp_sockaddr_entry
*addr
;
241 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
244 if (sctp_in_scope(&addr
->a
, scope
)) {
245 /* Now that the address is in scope, check to see if
246 * the address type is really supported by the local
247 * sock as well as the remote peer.
249 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
250 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
251 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
252 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
253 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
254 error
= sctp_add_bind_addr(bp
, &addr
->a
,
255 SCTP_ADDR_SRC
, GFP_ATOMIC
);
267 /* Initialize a sctp_addr from in incoming skb. */
268 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
275 port
= &addr
->v4
.sin_port
;
276 addr
->v4
.sin_family
= AF_INET
;
281 from
= &ip_hdr(skb
)->saddr
;
284 from
= &ip_hdr(skb
)->daddr
;
286 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
289 /* Initialize an sctp_addr from a socket. */
290 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
292 addr
->v4
.sin_family
= AF_INET
;
293 addr
->v4
.sin_port
= 0;
294 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->inet_rcv_saddr
;
297 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
298 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
300 inet_sk(sk
)->inet_rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
303 /* Initialize sk->sk_daddr from sctp_addr. */
304 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
306 inet_sk(sk
)->inet_daddr
= addr
->v4
.sin_addr
.s_addr
;
309 /* Initialize a sctp_addr from an address parameter. */
310 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
311 union sctp_addr_param
*param
,
312 __be16 port
, int iif
)
314 addr
->v4
.sin_family
= AF_INET
;
315 addr
->v4
.sin_port
= port
;
316 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
319 /* Initialize an address parameter from a sctp_addr and return the length
320 * of the address parameter.
322 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
323 union sctp_addr_param
*param
)
325 int length
= sizeof(sctp_ipv4addr_param_t
);
327 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
328 param
->v4
.param_hdr
.length
= htons(length
);
329 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
334 /* Initialize a sctp_addr from a dst_entry. */
335 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct flowi4
*fl4
,
338 saddr
->v4
.sin_family
= AF_INET
;
339 saddr
->v4
.sin_port
= port
;
340 saddr
->v4
.sin_addr
.s_addr
= fl4
->saddr
;
343 /* Compare two addresses exactly. */
344 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
345 const union sctp_addr
*addr2
)
347 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
349 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
351 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
357 /* Initialize addr struct to INADDR_ANY. */
358 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, __be16 port
)
360 addr
->v4
.sin_family
= AF_INET
;
361 addr
->v4
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
362 addr
->v4
.sin_port
= port
;
365 /* Is this a wildcard address? */
366 static int sctp_v4_is_any(const union sctp_addr
*addr
)
368 return htonl(INADDR_ANY
) == addr
->v4
.sin_addr
.s_addr
;
371 /* This function checks if the address is a valid address to be used for
375 * Return 0 - If the address is a non-unicast or an illegal address.
376 * Return 1 - If the address is a unicast.
378 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
379 struct sctp_sock
*sp
,
380 const struct sk_buff
*skb
)
382 /* IPv4 addresses not allowed */
383 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
386 /* Is this a non-unicast address or a unusable SCTP address? */
387 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
))
390 /* Is this a broadcast address? */
391 if (skb
&& skb_rtable(skb
)->rt_flags
& RTCF_BROADCAST
)
397 /* Should this be available for binding? */
398 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
400 int ret
= inet_addr_type(&init_net
, addr
->v4
.sin_addr
.s_addr
);
403 if (addr
->v4
.sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
405 !sp
->inet
.freebind
&&
406 !sysctl_ip_nonlocal_bind
)
409 if (ipv6_only_sock(sctp_opt2sk(sp
)))
415 /* Checking the loopback, private and other address scopes as defined in
416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
419 * Level 0 - unusable SCTP addresses
420 * Level 1 - loopback address
421 * Level 2 - link-local addresses
422 * Level 3 - private addresses.
423 * Level 4 - global addresses
424 * For INIT and INIT-ACK address list, let L be the level of
425 * of requested destination address, sender and receiver
426 * SHOULD include all of its addresses with level greater
427 * than or equal to L.
429 * IPv4 scoping can be controlled through sysctl option
430 * net.sctp.addr_scope_policy
432 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
436 /* Check for unusable SCTP addresses. */
437 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
)) {
438 retval
= SCTP_SCOPE_UNUSABLE
;
439 } else if (ipv4_is_loopback(addr
->v4
.sin_addr
.s_addr
)) {
440 retval
= SCTP_SCOPE_LOOPBACK
;
441 } else if (ipv4_is_linklocal_169(addr
->v4
.sin_addr
.s_addr
)) {
442 retval
= SCTP_SCOPE_LINK
;
443 } else if (ipv4_is_private_10(addr
->v4
.sin_addr
.s_addr
) ||
444 ipv4_is_private_172(addr
->v4
.sin_addr
.s_addr
) ||
445 ipv4_is_private_192(addr
->v4
.sin_addr
.s_addr
)) {
446 retval
= SCTP_SCOPE_PRIVATE
;
448 retval
= SCTP_SCOPE_GLOBAL
;
454 /* Returns a valid dst cache entry for the given source and destination ip
455 * addresses. If an association is passed, trys to get a dst entry with a
456 * source address that matches an address in the bind address list.
458 static void sctp_v4_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
459 struct flowi
*fl
, struct sock
*sk
)
461 struct sctp_association
*asoc
= t
->asoc
;
463 struct flowi4
*fl4
= &fl
->u
.ip4
;
464 struct sctp_bind_addr
*bp
;
465 struct sctp_sockaddr_entry
*laddr
;
466 struct dst_entry
*dst
= NULL
;
467 union sctp_addr
*daddr
= &t
->ipaddr
;
468 union sctp_addr dst_saddr
;
470 memset(fl4
, 0x0, sizeof(struct flowi4
));
471 fl4
->daddr
= daddr
->v4
.sin_addr
.s_addr
;
472 fl4
->fl4_dport
= daddr
->v4
.sin_port
;
473 fl4
->flowi4_proto
= IPPROTO_SCTP
;
475 fl4
->flowi4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
476 fl4
->flowi4_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
477 fl4
->fl4_sport
= htons(asoc
->base
.bind_addr
.port
);
480 fl4
->saddr
= saddr
->v4
.sin_addr
.s_addr
;
481 fl4
->fl4_sport
= saddr
->v4
.sin_port
;
484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
485 __func__
, &fl4
->daddr
, &fl4
->saddr
);
487 rt
= ip_route_output_key(&init_net
, fl4
);
491 /* If there is no association or if a source address is passed, no
492 * more validation is required.
497 bp
= &asoc
->base
.bind_addr
;
500 /* Walk through the bind address list and look for a bind
501 * address that matches the source address of the returned dst.
503 sctp_v4_dst_saddr(&dst_saddr
, fl4
, htons(bp
->port
));
505 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
506 if (!laddr
->valid
|| (laddr
->state
!= SCTP_ADDR_SRC
))
508 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
513 /* None of the bound addresses match the source address of the
514 * dst. So release it.
520 /* Walk through the bind address list and try to get a dst that
521 * matches a bind address as the source address.
524 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
527 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
528 (AF_INET
== laddr
->a
.sa
.sa_family
)) {
529 fl4
->saddr
= laddr
->a
.v4
.sin_addr
.s_addr
;
530 fl4
->fl4_sport
= laddr
->a
.v4
.sin_port
;
531 rt
= ip_route_output_key(&init_net
, fl4
);
544 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
545 &fl4
->daddr
, &fl4
->saddr
);
547 SCTP_DEBUG_PRINTK("NO ROUTE\n");
550 /* For v4, the source address is cached in the route entry(dst). So no need
551 * to cache it separately and hence this is an empty routine.
553 static void sctp_v4_get_saddr(struct sctp_sock
*sk
,
554 struct sctp_transport
*t
,
557 union sctp_addr
*saddr
= &t
->saddr
;
558 struct rtable
*rt
= (struct rtable
*)t
->dst
;
561 saddr
->v4
.sin_family
= AF_INET
;
562 saddr
->v4
.sin_addr
.s_addr
= fl
->u
.ip4
.saddr
;
566 /* What interface did this skb arrive on? */
567 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
569 return skb_rtable(skb
)->rt_iif
;
572 /* Was this packet marked by Explicit Congestion Notification? */
573 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
575 return INET_ECN_is_ce(ip_hdr(skb
)->tos
);
578 /* Create and initialize a new sk for the socket returned by accept(). */
579 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
580 struct sctp_association
*asoc
)
582 struct sock
*newsk
= sk_alloc(sock_net(sk
), PF_INET
, GFP_KERNEL
,
584 struct inet_sock
*newinet
;
589 sock_init_data(NULL
, newsk
);
591 sctp_copy_sock(newsk
, sk
, asoc
);
592 sock_reset_flag(newsk
, SOCK_ZAPPED
);
594 newinet
= inet_sk(newsk
);
596 newinet
->inet_daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
598 sk_refcnt_debug_inc(newsk
);
600 if (newsk
->sk_prot
->init(newsk
)) {
601 sk_common_release(newsk
);
609 /* Map address, empty for v4 family */
610 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
615 /* Dump the v4 addr to the seq file. */
616 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
618 seq_printf(seq
, "%pI4 ", &addr
->v4
.sin_addr
);
621 static void sctp_v4_ecn_capable(struct sock
*sk
)
626 void sctp_addr_wq_timeout_handler(unsigned long arg
)
628 struct sctp_sockaddr_entry
*addrw
, *temp
;
629 struct sctp_sock
*sp
;
631 spin_lock_bh(&sctp_addr_wq_lock
);
633 list_for_each_entry_safe(addrw
, temp
, &sctp_addr_waitq
, list
) {
634 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
635 " for cmd %d at entry %p\n", &sctp_addr_waitq
, &addrw
->a
, addrw
->state
,
638 /* Now we send an ASCONF for each association */
639 /* Note. we currently don't handle link local IPv6 addressees */
640 if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
641 struct in6_addr
*in6
;
643 if (ipv6_addr_type(&addrw
->a
.v6
.sin6_addr
) &
647 in6
= (struct in6_addr
*)&addrw
->a
.v6
.sin6_addr
;
648 if (ipv6_chk_addr(&init_net
, in6
, NULL
, 0) == 0 &&
649 addrw
->state
== SCTP_ADDR_NEW
) {
650 unsigned long timeo_val
;
652 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
653 SCTP_ADDRESS_TICK_DELAY
);
655 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
656 mod_timer(&sctp_addr_wq_timer
, timeo_val
);
661 list_for_each_entry(sp
, &sctp_auto_asconf_splist
, auto_asconf_list
) {
664 sk
= sctp_opt2sk(sp
);
665 /* ignore bound-specific endpoints */
666 if (!sctp_is_ep_boundall(sk
))
668 sctp_bh_lock_sock(sk
);
669 if (sctp_asconf_mgmt(sp
, addrw
) < 0)
670 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
671 sctp_bh_unlock_sock(sk
);
674 list_del(&addrw
->list
);
677 spin_unlock_bh(&sctp_addr_wq_lock
);
680 static void sctp_free_addr_wq(void)
682 struct sctp_sockaddr_entry
*addrw
;
683 struct sctp_sockaddr_entry
*temp
;
685 spin_lock_bh(&sctp_addr_wq_lock
);
686 del_timer(&sctp_addr_wq_timer
);
687 list_for_each_entry_safe(addrw
, temp
, &sctp_addr_waitq
, list
) {
688 list_del(&addrw
->list
);
691 spin_unlock_bh(&sctp_addr_wq_lock
);
694 /* lookup the entry for the same address in the addr_waitq
695 * sctp_addr_wq MUST be locked
697 static struct sctp_sockaddr_entry
*sctp_addr_wq_lookup(struct sctp_sockaddr_entry
*addr
)
699 struct sctp_sockaddr_entry
*addrw
;
701 list_for_each_entry(addrw
, &sctp_addr_waitq
, list
) {
702 if (addrw
->a
.sa
.sa_family
!= addr
->a
.sa
.sa_family
)
704 if (addrw
->a
.sa
.sa_family
== AF_INET
) {
705 if (addrw
->a
.v4
.sin_addr
.s_addr
==
706 addr
->a
.v4
.sin_addr
.s_addr
)
708 } else if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
709 if (ipv6_addr_equal(&addrw
->a
.v6
.sin6_addr
,
710 &addr
->a
.v6
.sin6_addr
))
717 void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry
*addr
, int cmd
)
719 struct sctp_sockaddr_entry
*addrw
;
720 unsigned long timeo_val
;
722 /* first, we check if an opposite message already exist in the queue.
723 * If we found such message, it is removed.
724 * This operation is a bit stupid, but the DHCP client attaches the
725 * new address after a couple of addition and deletion of that address
728 spin_lock_bh(&sctp_addr_wq_lock
);
729 /* Offsets existing events in addr_wq */
730 addrw
= sctp_addr_wq_lookup(addr
);
732 if (addrw
->state
!= cmd
) {
733 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
734 " in wq %p\n", addrw
->state
, &addrw
->a
,
736 list_del(&addrw
->list
);
739 spin_unlock_bh(&sctp_addr_wq_lock
);
743 /* OK, we have to add the new address to the wait queue */
744 addrw
= kmemdup(addr
, sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
746 spin_unlock_bh(&sctp_addr_wq_lock
);
750 list_add_tail(&addrw
->list
, &sctp_addr_waitq
);
751 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
752 " in wq %p\n", addrw
->state
, &addrw
->a
, &sctp_addr_waitq
);
754 if (!timer_pending(&sctp_addr_wq_timer
)) {
756 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
757 mod_timer(&sctp_addr_wq_timer
, timeo_val
);
759 spin_unlock_bh(&sctp_addr_wq_lock
);
762 /* Event handler for inet address addition/deletion events.
763 * The sctp_local_addr_list needs to be protocted by a spin lock since
764 * multiple notifiers (say IPv4 and IPv6) may be running at the same
765 * time and thus corrupt the list.
766 * The reader side is protected with RCU.
768 static int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
771 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
772 struct sctp_sockaddr_entry
*addr
= NULL
;
773 struct sctp_sockaddr_entry
*temp
;
776 if (!net_eq(dev_net(ifa
->ifa_dev
->dev
), &init_net
))
781 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
783 addr
->a
.v4
.sin_family
= AF_INET
;
784 addr
->a
.v4
.sin_port
= 0;
785 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
787 spin_lock_bh(&sctp_local_addr_lock
);
788 list_add_tail_rcu(&addr
->list
, &sctp_local_addr_list
);
789 sctp_addr_wq_mgmt(addr
, SCTP_ADDR_NEW
);
790 spin_unlock_bh(&sctp_local_addr_lock
);
794 spin_lock_bh(&sctp_local_addr_lock
);
795 list_for_each_entry_safe(addr
, temp
,
796 &sctp_local_addr_list
, list
) {
797 if (addr
->a
.sa
.sa_family
== AF_INET
&&
798 addr
->a
.v4
.sin_addr
.s_addr
==
800 sctp_addr_wq_mgmt(addr
, SCTP_ADDR_DEL
);
803 list_del_rcu(&addr
->list
);
807 spin_unlock_bh(&sctp_local_addr_lock
);
809 kfree_rcu(addr
, rcu
);
817 * Initialize the control inode/socket with a control endpoint data
818 * structure. This endpoint is reserved exclusively for the OOTB processing.
820 static int sctp_ctl_sock_init(void)
823 sa_family_t family
= PF_INET
;
825 if (sctp_get_pf_specific(PF_INET6
))
828 err
= inet_ctl_sock_create(&sctp_ctl_sock
, family
,
829 SOCK_SEQPACKET
, IPPROTO_SCTP
, &init_net
);
831 /* If IPv6 socket could not be created, try the IPv4 socket */
832 if (err
< 0 && family
== PF_INET6
)
833 err
= inet_ctl_sock_create(&sctp_ctl_sock
, AF_INET
,
834 SOCK_SEQPACKET
, IPPROTO_SCTP
,
838 pr_err("Failed to create the SCTP control socket\n");
844 /* Register address family specific functions. */
845 int sctp_register_af(struct sctp_af
*af
)
847 switch (af
->sa_family
) {
849 if (sctp_af_v4_specific
)
851 sctp_af_v4_specific
= af
;
854 if (sctp_af_v6_specific
)
856 sctp_af_v6_specific
= af
;
862 INIT_LIST_HEAD(&af
->list
);
863 list_add_tail(&af
->list
, &sctp_address_families
);
867 /* Get the table of functions for manipulating a particular address
870 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
874 return sctp_af_v4_specific
;
876 return sctp_af_v6_specific
;
882 /* Common code to initialize a AF_INET msg_name. */
883 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
885 struct sockaddr_in
*sin
;
887 sin
= (struct sockaddr_in
*)msgname
;
888 *addr_len
= sizeof(struct sockaddr_in
);
889 sin
->sin_family
= AF_INET
;
890 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
893 /* Copy the primary address of the peer primary address as the msg_name. */
894 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
897 struct sockaddr_in
*sin
, *sinfrom
;
900 struct sctp_association
*asoc
;
903 sctp_inet_msgname(msgname
, addr_len
);
904 sin
= (struct sockaddr_in
*)msgname
;
905 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
906 sin
->sin_port
= htons(asoc
->peer
.port
);
907 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
911 /* Initialize and copy out a msgname from an inbound skb. */
912 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
915 struct sctphdr
*sh
= sctp_hdr(skb
);
916 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msgname
;
918 sctp_inet_msgname(msgname
, len
);
919 sin
->sin_port
= sh
->source
;
920 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
924 /* Do we support this AF? */
925 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
927 /* PF_INET only supports AF_INET addresses. */
928 return AF_INET
== family
;
931 /* Address matching with wildcards allowed. */
932 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
933 const union sctp_addr
*addr2
,
934 struct sctp_sock
*opt
)
936 /* PF_INET only supports AF_INET addresses. */
937 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
939 if (htonl(INADDR_ANY
) == addr1
->v4
.sin_addr
.s_addr
||
940 htonl(INADDR_ANY
) == addr2
->v4
.sin_addr
.s_addr
)
942 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
948 /* Verify that provided sockaddr looks bindable. Common verification has
949 * already been taken care of.
951 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
953 return sctp_v4_available(addr
, opt
);
956 /* Verify that sockaddr looks sendable. Common verification has already
957 * been taken care of.
959 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
964 /* Fill in Supported Address Type information for INIT and INIT-ACK
965 * chunks. Returns number of addresses supported.
967 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
970 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
974 /* Wrapper routine that calls the ip transmit routine. */
975 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
976 struct sctp_transport
*transport
)
978 struct inet_sock
*inet
= inet_sk(skb
->sk
);
980 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
981 __func__
, skb
, skb
->len
,
982 &transport
->fl
.u
.ip4
.saddr
,
983 &transport
->fl
.u
.ip4
.daddr
);
985 inet
->pmtudisc
= transport
->param_flags
& SPP_PMTUD_ENABLE
?
986 IP_PMTUDISC_DO
: IP_PMTUDISC_DONT
;
988 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
989 return ip_queue_xmit(skb
, &transport
->fl
);
992 static struct sctp_af sctp_af_inet
;
994 static struct sctp_pf sctp_pf_inet
= {
995 .event_msgname
= sctp_inet_event_msgname
,
996 .skb_msgname
= sctp_inet_skb_msgname
,
997 .af_supported
= sctp_inet_af_supported
,
998 .cmp_addr
= sctp_inet_cmp_addr
,
999 .bind_verify
= sctp_inet_bind_verify
,
1000 .send_verify
= sctp_inet_send_verify
,
1001 .supported_addrs
= sctp_inet_supported_addrs
,
1002 .create_accept_sk
= sctp_v4_create_accept_sk
,
1003 .addr_v4map
= sctp_v4_addr_v4map
,
1007 /* Notifier for inetaddr addition/deletion events. */
1008 static struct notifier_block sctp_inetaddr_notifier
= {
1009 .notifier_call
= sctp_inetaddr_event
,
1012 /* Socket operations. */
1013 static const struct proto_ops inet_seqpacket_ops
= {
1015 .owner
= THIS_MODULE
,
1016 .release
= inet_release
, /* Needs to be wrapped... */
1018 .connect
= inet_dgram_connect
,
1019 .socketpair
= sock_no_socketpair
,
1020 .accept
= inet_accept
,
1021 .getname
= inet_getname
, /* Semantics are different. */
1023 .ioctl
= inet_ioctl
,
1024 .listen
= sctp_inet_listen
,
1025 .shutdown
= inet_shutdown
, /* Looks harmless. */
1026 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem */
1027 .getsockopt
= sock_common_getsockopt
,
1028 .sendmsg
= inet_sendmsg
,
1029 .recvmsg
= sock_common_recvmsg
,
1030 .mmap
= sock_no_mmap
,
1031 .sendpage
= sock_no_sendpage
,
1032 #ifdef CONFIG_COMPAT
1033 .compat_setsockopt
= compat_sock_common_setsockopt
,
1034 .compat_getsockopt
= compat_sock_common_getsockopt
,
1038 /* Registration with AF_INET family. */
1039 static struct inet_protosw sctp_seqpacket_protosw
= {
1040 .type
= SOCK_SEQPACKET
,
1041 .protocol
= IPPROTO_SCTP
,
1043 .ops
= &inet_seqpacket_ops
,
1045 .flags
= SCTP_PROTOSW_FLAG
1047 static struct inet_protosw sctp_stream_protosw
= {
1048 .type
= SOCK_STREAM
,
1049 .protocol
= IPPROTO_SCTP
,
1051 .ops
= &inet_seqpacket_ops
,
1053 .flags
= SCTP_PROTOSW_FLAG
1056 /* Register with IP layer. */
1057 static const struct net_protocol sctp_protocol
= {
1058 .handler
= sctp_rcv
,
1059 .err_handler
= sctp_v4_err
,
1063 /* IPv4 address related functions. */
1064 static struct sctp_af sctp_af_inet
= {
1065 .sa_family
= AF_INET
,
1066 .sctp_xmit
= sctp_v4_xmit
,
1067 .setsockopt
= ip_setsockopt
,
1068 .getsockopt
= ip_getsockopt
,
1069 .get_dst
= sctp_v4_get_dst
,
1070 .get_saddr
= sctp_v4_get_saddr
,
1071 .copy_addrlist
= sctp_v4_copy_addrlist
,
1072 .from_skb
= sctp_v4_from_skb
,
1073 .from_sk
= sctp_v4_from_sk
,
1074 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
1075 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
1076 .from_addr_param
= sctp_v4_from_addr_param
,
1077 .to_addr_param
= sctp_v4_to_addr_param
,
1078 .cmp_addr
= sctp_v4_cmp_addr
,
1079 .addr_valid
= sctp_v4_addr_valid
,
1080 .inaddr_any
= sctp_v4_inaddr_any
,
1081 .is_any
= sctp_v4_is_any
,
1082 .available
= sctp_v4_available
,
1083 .scope
= sctp_v4_scope
,
1084 .skb_iif
= sctp_v4_skb_iif
,
1085 .is_ce
= sctp_v4_is_ce
,
1086 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
1087 .ecn_capable
= sctp_v4_ecn_capable
,
1088 .net_header_len
= sizeof(struct iphdr
),
1089 .sockaddr_len
= sizeof(struct sockaddr_in
),
1090 #ifdef CONFIG_COMPAT
1091 .compat_setsockopt
= compat_ip_setsockopt
,
1092 .compat_getsockopt
= compat_ip_getsockopt
,
1096 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
1100 return sctp_pf_inet_specific
;
1102 return sctp_pf_inet6_specific
;
1108 /* Register the PF specific function table. */
1109 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
1113 if (sctp_pf_inet_specific
)
1115 sctp_pf_inet_specific
= pf
;
1118 if (sctp_pf_inet6_specific
)
1120 sctp_pf_inet6_specific
= pf
;
1128 static inline int init_sctp_mibs(void)
1130 return snmp_mib_init((void __percpu
**)sctp_statistics
,
1131 sizeof(struct sctp_mib
),
1132 __alignof__(struct sctp_mib
));
1135 static inline void cleanup_sctp_mibs(void)
1137 snmp_mib_free((void __percpu
**)sctp_statistics
);
1140 static void sctp_v4_pf_init(void)
1142 /* Initialize the SCTP specific PF functions. */
1143 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1144 sctp_register_af(&sctp_af_inet
);
1147 static void sctp_v4_pf_exit(void)
1149 list_del(&sctp_af_inet
.list
);
1152 static int sctp_v4_protosw_init(void)
1156 rc
= proto_register(&sctp_prot
, 1);
1160 /* Register SCTP(UDP and TCP style) with socket layer. */
1161 inet_register_protosw(&sctp_seqpacket_protosw
);
1162 inet_register_protosw(&sctp_stream_protosw
);
1167 static void sctp_v4_protosw_exit(void)
1169 inet_unregister_protosw(&sctp_stream_protosw
);
1170 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1171 proto_unregister(&sctp_prot
);
1174 static int sctp_v4_add_protocol(void)
1176 /* Register notifier for inet address additions/deletions. */
1177 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1179 /* Register SCTP with inet layer. */
1180 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0)
1186 static void sctp_v4_del_protocol(void)
1188 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1189 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1192 /* Initialize the universe into something sensible. */
1193 SCTP_STATIC __init
int sctp_init(void)
1196 int status
= -EINVAL
;
1198 unsigned long limit
;
1199 unsigned long nr_pages
;
1203 /* SCTP_DEBUG sanity check. */
1204 if (!sctp_sanity_check())
1207 /* Allocate bind_bucket and chunk caches. */
1209 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1210 sizeof(struct sctp_bind_bucket
),
1211 0, SLAB_HWCACHE_ALIGN
,
1213 if (!sctp_bucket_cachep
)
1216 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1217 sizeof(struct sctp_chunk
),
1218 0, SLAB_HWCACHE_ALIGN
,
1220 if (!sctp_chunk_cachep
)
1221 goto err_chunk_cachep
;
1223 /* Allocate and initialise sctp mibs. */
1224 status
= init_sctp_mibs();
1228 /* Initialize proc fs directory. */
1229 status
= sctp_proc_init();
1233 /* Initialize object count debugging. */
1234 sctp_dbg_objcnt_init();
1237 * 14. Suggested SCTP Protocol Parameter Values
1239 /* The following protocol parameters are RECOMMENDED: */
1240 /* RTO.Initial - 3 seconds */
1241 sctp_rto_initial
= SCTP_RTO_INITIAL
;
1242 /* RTO.Min - 1 second */
1243 sctp_rto_min
= SCTP_RTO_MIN
;
1244 /* RTO.Max - 60 seconds */
1245 sctp_rto_max
= SCTP_RTO_MAX
;
1246 /* RTO.Alpha - 1/8 */
1247 sctp_rto_alpha
= SCTP_RTO_ALPHA
;
1248 /* RTO.Beta - 1/4 */
1249 sctp_rto_beta
= SCTP_RTO_BETA
;
1251 /* Valid.Cookie.Life - 60 seconds */
1252 sctp_valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1254 /* Whether Cookie Preservative is enabled(1) or not(0) */
1255 sctp_cookie_preserve_enable
= 1;
1258 sctp_max_burst
= SCTP_DEFAULT_MAX_BURST
;
1260 /* Association.Max.Retrans - 10 attempts
1261 * Path.Max.Retrans - 5 attempts (per destination address)
1262 * Max.Init.Retransmits - 8 attempts
1264 sctp_max_retrans_association
= 10;
1265 sctp_max_retrans_path
= 5;
1266 sctp_max_retrans_init
= 8;
1268 /* Sendbuffer growth - do per-socket accounting */
1269 sctp_sndbuf_policy
= 0;
1271 /* Rcvbuffer growth - do per-socket accounting */
1272 sctp_rcvbuf_policy
= 0;
1274 /* HB.interval - 30 seconds */
1275 sctp_hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1277 /* delayed SACK timeout */
1278 sctp_sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1280 /* Implementation specific variables. */
1282 /* Initialize default stream count setup information. */
1283 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1284 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1286 /* Initialize handle used for association ids. */
1287 idr_init(&sctp_assocs_id
);
1289 /* Set the pressure threshold to be a fraction of global memory that
1290 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1291 * memory, with a floor of 128 pages.
1292 * Note this initializes the data in sctpv6_prot too
1293 * Unabashedly stolen from tcp_init
1295 nr_pages
= totalram_pages
- totalhigh_pages
;
1296 limit
= min(nr_pages
, 1UL<<(28-PAGE_SHIFT
)) >> (20-PAGE_SHIFT
);
1297 limit
= (limit
* (nr_pages
>> (20-PAGE_SHIFT
))) >> (PAGE_SHIFT
-11);
1298 limit
= max(limit
, 128UL);
1299 sysctl_sctp_mem
[0] = limit
/ 4 * 3;
1300 sysctl_sctp_mem
[1] = limit
;
1301 sysctl_sctp_mem
[2] = sysctl_sctp_mem
[0] * 2;
1303 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1304 limit
= (sysctl_sctp_mem
[1]) << (PAGE_SHIFT
- 7);
1305 max_share
= min(4UL*1024*1024, limit
);
1307 sysctl_sctp_rmem
[0] = SK_MEM_QUANTUM
; /* give each asoc 1 page min */
1308 sysctl_sctp_rmem
[1] = (1500 *(sizeof(struct sk_buff
) + 1));
1309 sysctl_sctp_rmem
[2] = max(sysctl_sctp_rmem
[1], max_share
);
1311 sysctl_sctp_wmem
[0] = SK_MEM_QUANTUM
;
1312 sysctl_sctp_wmem
[1] = 16*1024;
1313 sysctl_sctp_wmem
[2] = max(64*1024, max_share
);
1315 /* Size and allocate the association hash table.
1316 * The methodology is similar to that of the tcp hash tables.
1318 if (totalram_pages
>= (128 * 1024))
1319 goal
= totalram_pages
>> (22 - PAGE_SHIFT
);
1321 goal
= totalram_pages
>> (24 - PAGE_SHIFT
);
1323 for (order
= 0; (1UL << order
) < goal
; order
++)
1327 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1328 sizeof(struct sctp_hashbucket
);
1329 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1331 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1332 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1333 } while (!sctp_assoc_hashtable
&& --order
> 0);
1334 if (!sctp_assoc_hashtable
) {
1335 pr_err("Failed association hash alloc\n");
1337 goto err_ahash_alloc
;
1339 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1340 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1341 INIT_HLIST_HEAD(&sctp_assoc_hashtable
[i
].chain
);
1344 /* Allocate and initialize the endpoint hash table. */
1345 sctp_ep_hashsize
= 64;
1346 sctp_ep_hashtable
= (struct sctp_hashbucket
*)
1347 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1348 if (!sctp_ep_hashtable
) {
1349 pr_err("Failed endpoint_hash alloc\n");
1351 goto err_ehash_alloc
;
1353 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1354 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1355 INIT_HLIST_HEAD(&sctp_ep_hashtable
[i
].chain
);
1358 /* Allocate and initialize the SCTP port hash table. */
1360 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1361 sizeof(struct sctp_bind_hashbucket
);
1362 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1364 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1365 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1366 } while (!sctp_port_hashtable
&& --order
> 0);
1367 if (!sctp_port_hashtable
) {
1368 pr_err("Failed bind hash alloc\n");
1370 goto err_bhash_alloc
;
1372 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1373 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1374 INIT_HLIST_HEAD(&sctp_port_hashtable
[i
].chain
);
1377 pr_info("Hash tables configured (established %d bind %d)\n",
1378 sctp_assoc_hashsize
, sctp_port_hashsize
);
1380 /* Disable ADDIP by default. */
1381 sctp_addip_enable
= 0;
1382 sctp_addip_noauth
= 0;
1383 sctp_default_auto_asconf
= 0;
1385 /* Enable PR-SCTP by default. */
1386 sctp_prsctp_enable
= 1;
1388 /* Disable AUTH by default. */
1389 sctp_auth_enable
= 0;
1391 /* Set SCOPE policy to enabled */
1392 sctp_scope_policy
= SCTP_SCOPE_POLICY_ENABLE
;
1394 /* Set the default rwnd update threshold */
1395 sctp_rwnd_upd_shift
= SCTP_DEFAULT_RWND_SHIFT
;
1397 sctp_sysctl_register();
1399 INIT_LIST_HEAD(&sctp_address_families
);
1403 /* Initialize the local address list. */
1404 INIT_LIST_HEAD(&sctp_local_addr_list
);
1405 spin_lock_init(&sctp_local_addr_lock
);
1406 sctp_get_local_addr_list();
1408 /* Initialize the address event list */
1409 INIT_LIST_HEAD(&sctp_addr_waitq
);
1410 INIT_LIST_HEAD(&sctp_auto_asconf_splist
);
1411 spin_lock_init(&sctp_addr_wq_lock
);
1412 sctp_addr_wq_timer
.expires
= 0;
1413 setup_timer(&sctp_addr_wq_timer
, sctp_addr_wq_timeout_handler
, 0);
1415 status
= sctp_v4_protosw_init();
1418 goto err_protosw_init
;
1420 status
= sctp_v6_protosw_init();
1422 goto err_v6_protosw_init
;
1424 /* Initialize the control inode/socket for handling OOTB packets. */
1425 if ((status
= sctp_ctl_sock_init())) {
1426 pr_err("Failed to initialize the SCTP control sock\n");
1427 goto err_ctl_sock_init
;
1430 status
= sctp_v4_add_protocol();
1432 goto err_add_protocol
;
1434 /* Register SCTP with inet6 layer. */
1435 status
= sctp_v6_add_protocol();
1437 goto err_v6_add_protocol
;
1442 err_v6_add_protocol
:
1443 sctp_v4_del_protocol();
1445 inet_ctl_sock_destroy(sctp_ctl_sock
);
1447 sctp_v6_protosw_exit();
1448 err_v6_protosw_init
:
1449 sctp_v4_protosw_exit();
1451 sctp_free_local_addr_list();
1454 sctp_sysctl_unregister();
1455 free_pages((unsigned long)sctp_port_hashtable
,
1456 get_order(sctp_port_hashsize
*
1457 sizeof(struct sctp_bind_hashbucket
)));
1459 kfree(sctp_ep_hashtable
);
1461 free_pages((unsigned long)sctp_assoc_hashtable
,
1462 get_order(sctp_assoc_hashsize
*
1463 sizeof(struct sctp_hashbucket
)));
1465 sctp_dbg_objcnt_exit();
1468 cleanup_sctp_mibs();
1470 kmem_cache_destroy(sctp_chunk_cachep
);
1472 kmem_cache_destroy(sctp_bucket_cachep
);
1476 /* Exit handler for the SCTP protocol. */
1477 SCTP_STATIC __exit
void sctp_exit(void)
1479 /* BUG. This should probably do something useful like clean
1480 * up all the remaining associations and all that memory.
1483 /* Unregister with inet6/inet layers. */
1484 sctp_v6_del_protocol();
1485 sctp_v4_del_protocol();
1486 sctp_free_addr_wq();
1488 /* Free the control endpoint. */
1489 inet_ctl_sock_destroy(sctp_ctl_sock
);
1491 /* Free protosw registrations */
1492 sctp_v6_protosw_exit();
1493 sctp_v4_protosw_exit();
1495 /* Free the local address list. */
1496 sctp_free_local_addr_list();
1498 /* Unregister with socket layer. */
1502 sctp_sysctl_unregister();
1504 free_pages((unsigned long)sctp_assoc_hashtable
,
1505 get_order(sctp_assoc_hashsize
*
1506 sizeof(struct sctp_hashbucket
)));
1507 kfree(sctp_ep_hashtable
);
1508 free_pages((unsigned long)sctp_port_hashtable
,
1509 get_order(sctp_port_hashsize
*
1510 sizeof(struct sctp_bind_hashbucket
)));
1512 sctp_dbg_objcnt_exit();
1514 cleanup_sctp_mibs();
1516 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1518 kmem_cache_destroy(sctp_chunk_cachep
);
1519 kmem_cache_destroy(sctp_bucket_cachep
);
1522 module_init(sctp_init
);
1523 module_exit(sctp_exit
);
1526 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1528 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1529 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-132");
1530 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1531 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1532 module_param_named(no_checksums
, sctp_checksum_disable
, bool, 0644);
1533 MODULE_PARM_DESC(no_checksums
, "Disable checksums computing and verification");
1534 MODULE_LICENSE("GPL");